Fosgate Amp, 201s Shorting Out
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=35525
Printed Date: July 29, 2025 at 3:04 AM
Topic: Fosgate Amp, 201s Shorting Out
Posted By: defaz
Subject: Fosgate Amp, 201s Shorting Out
Date Posted: July 13, 2004 at 12:17 PM
This amp is only a few months old... Basically, there's power current leaking through to the speaker connections, and whenever I hook something up to either of the channels, usually a subwoofer, the sub will go BZZZZZ and either top out or bottom out depending on the + and - connections... Right now I have it sitting in my room hooked up to a 12v power supply with NO RCAs plugged in, and I'm hooking a 4ohm svc Kicker Comp up. All I get is BZZZZ And I'm guessing something's shorting out BAD. Anyone with electrical experience out there? I just need to be pointed the right direction... Thanks
Replies:
Posted By: defaz
Date Posted: July 13, 2004 at 12:20 PM
haha Just realised I misspelled Fosgate... Dont worry, I'm not that much of a NooB....
Posted By: kgerry
Date Posted: July 13, 2004 at 1:21 PM
is this a regulated, hi amperage power supply you've got it hooked up to? it sounds like you may be hearing a nasty 60 cycle hum if it isnt..... is the amp remoted on? ( I'm presuming it is ) when the amp is remoted on at no load input meter the output terminal for voltage and see what you get .... most output stages use some type of a protection circuit to detect DC at the output rail and shut down the power supply's PWM IC, but this unit may not..... i have seen amps that blow an output driver and still run but shunt supply voltage straight to the speaker..... does this problem occur in a car or only in your house? if the latter i'd suspect the power supply you have it hooked up to ------------- Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: defaz
Date Posted: July 13, 2004 at 6:34 PM
Yes, It's a decent power supply (I use it for testing HUs and stuff), and the reason I'm testing it inside is because it's HOT out there... This problem started while hooked up in my car. I do have 12v goign to the remote as well...
I hooked my tester to the output terminals and got a 28.6v reading on the damaged channel. The other channel (which I think is working fine) gets a reading of 0.
This is kinda weird...
Posted By: kgerry
Date Posted: July 14, 2004 at 10:00 AM
sounds like cooked outputs on the one channel
-------------
Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: defaz
Date Posted: July 14, 2004 at 11:29 AM
so is this one of those "it would cost less just to buy a new amp" issues??
Posted By: kgerry
Date Posted: July 14, 2004 at 12:34 PM
i'd call it one of those... "spring the estimate fee to have a authorized service center take a look at it " issues..... you can always run out and buy a new one if it's beyond a cost effective repair...... ------------- Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: defaz
Date Posted: July 14, 2004 at 12:54 PM
hmm, we're talking about an $80 amp, and most shops have a hefty fee for just looking at it... I'll just use it as a low power one channel...
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